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Knowledge of the general cycle of nuclear divisions in an organism is quite a useful guide in selecting the appropriate times for collection of material for cytolo gical studies. Thus, to study nucleoli, the best times for collecting the experimental material would be when interphase stages are most frequent in the cycle; and for physiological treatments to effect C-mitosis, the best times for collecting the experi mental material might be about just before metaphase stages show up most abundant ly in the cycle. Changes in environmental conditions, such as temperature, acidity, and illumi nation, may affect the pattern of nuclear divisions. On the other hand, if the pattern of nuclear divisions is found not to be susceptible to changes in environmental conditions, the experimenter would be free to collect his material or to pre-treat it at any time of the day, as opposed to being restricted to specific times only. The object of the investigation was to find out whether throughout a continuous period of 12 hours there were any significant variations in the relative frequencies of the mitotic stages in the root-tips of an Hydrocleis nymphoides cultivation at the Uni versity of Ghana, Legon. The cultivation was in a pond in the teaching garden of the Botany Department.

Daily Cycle of Mitotis in Root Tips of <i>Hydrocleis nymphoides</i> (Willd). Buchenau